Travel safety apparatus for vehicle

Abstract

A travel safety apparatus for a vehicle, the apparatus includes: a first detector detecting an object in a first detection area; a second detector detecting the object in a second detection area; a braking device decelerating the vehicle; an alarm device which outputs an alarm to an occupant of the vehicle; a third detector measuring the traveling state of the vehicle; a collision determination device which determines a possibility of a collision between the vehicle and the object based on the traveling state; and a controller which operates at least one of the braking device and the alarm device when there is the possibility of collision, wherein the controller changes at least one of operation timing of the alarm device, operation timing of the braking device, and deceleration degree made by the braking device in accordance with whether or not the first detector and the second detector detect the object.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a travel safety apparatus for a vehicle.[0003]Priority is claimed on Japanese Patent Application No. 2005-250885, filed Aug. 31, 2005 and Japanese Patent Application No. 2006-169105, filed Jun. 19, 2006, the contents of which are incorporated herein by reference.[0004]2. Description of Related Art[0005]An apparatus is known for detecting an object around a vehicle for preventing a collision between the object and the vehicle or for reducing damage due to the collision, the apparatus having a plurality of detectors such as a radar and an imaging device and recognizing the object based on detection results of the detectors (see, for example, Japanese Unexamined Patent Application, First Publication No. 2002-99907).[0006]In the apparatus of the aforementioned related art, a predetermined approximately sectorial detection assurance range in which a predetermined detecting accuracy is secured...

AI Technical Summary

Benefits of technology

[0008]The present invention was made in view of the above circumstances, and an object thereof is to provide a travel safety apparatus for a vehicle which can perform operations for preventing a collision between the vehicle and an object around the vehicle or reducing the damage due to the collision at a proper timing and condition without enlarging the detection assurance range of a plurality of detectors.

[0010]Accordingly, the travel safety apparatus of the present invention can prevent a collision or reduce damage due to a collision at a proper timing and condition in accordance with the object detection conditions of the first detector and the second detector, that is, reliabilities in each detection result.

[0013]In this case, when only the second detector detects the object, the travel safety apparatus determines the reliability of the collision determination result is lower than when only the first detector such as cameras detect the object or when both of the radar and the cameras detect the object, and delays the operation timing of alarming and / or deceleration. The alarming and deceleration at improper timing thus can be avoided.

[0015]In this case, if the object is continuously detected only by the cameras for a predetermined period of time, the safety apparatus determines that the reliability of the collision determination result is higher than before the object is continuously detected. The safety apparatus can perform proper operations for preventing a collision or reducing damage due to a collision by decelerating at the greater second deceleration degree.

[0017]In this case, the travel safety apparatus determines that the reliability of the collision determination result of the collision determination device is higher in the first condition than in the second condition. The travel safety apparatus can perform proper operations for preventing a collision or reducing damage due to a collision by setting the second deceleration degree to the braking device. In addition, the deceleration degree is maintained as the second deceleration degree when the first condition changes into the second condition. The occupant's sense of discomfort about the traveling of the vehicle thus can be avoided.

Problems solved by technology

However, the center angle of the detection assurance range of the radar is not easy to enlarge, while that of the imaging device can be enlarged, for example by applying a wide-angle lens.

This is a cause of complexity in the apparatus constitution and rising cost.

In addition, since the imaging device has shorter a assured detecting distance than the radar, the detection reliability of the imaging device tends to decline in accordance with changes of conditions such as weather.

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